On 21 Jan, 00:02, "Mark" wrote:
I've got a
conservatory on the drawing board - bit smaller than this one and
obviously this thread is of interest.

A fan unit connected as a separate zone to existing central heating
system is ideal. It can maintain a background level of warmth. It
can be turned up if one decides to use the room and will then
rapidly warm it up. It will react rapidly to solar changes.

My question was about Gas wall heaters and remains unanswered....anybody?

mark

I put a balanced flue gas wall heater in the conservatory at my last
house as it was a less complex option than a radiator. The main
function of the heater was to keep the room frost free at night in
winter and I'd have needed a separate circuit for a radiator with a
long pipe run.

The main problem I had was that the smallest gas heater I could find
was still too big for the job even on the lowest setting. There were
occasions when the roof vents would open at night because the room got
too hot!